ML20085L638

RO 50-275/75/8:on 750428,insp Revealed That Adequate Fire Stops in Vertical Cableways Between Floors in Reactor Bldg, in Horizontal Cable Trays & in Vertical Cable Ducts Not Installed Per FSAR Commitment.Cause Not Stated

ML20085L638
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/21/1975
From:	Swart F PUBLIC SERVICE CO. OF COLORADO
To:	Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
RO-50-267-75-8, NUDOCS 8311020165
Download: ML20085L638 (3)

Text

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1 public servlee company on' cellende P. O. Box 361, Platteville, Colorado 80651 , -. .

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July 21, 1975 }~#

Mr. E. Morris Howard, Director ,

Nuclear Regulatory Commission Region IV Office of Inspection and Enforcement Suite 1000 Arlington, Texas 76012

• . ' Ref: Facility Operating License No. DPR-34 Docket No. 50-267

Dear Mr. Howard:

Enclosed please find a copy of Unusual Event Report No. 50-267/75/8, Final, submitted per the requirements of the Technical Specifications.

Very truly yours,

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@- w s Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES/Alk .

cc: Mr. Angelo Ciambusso P0. .

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o REPORT DATE: July 16, 1975 UNUSUAL EVENT OCCURRENCE DATE: April 28,1975 FORT ST. VRAIN NUCLEAR CENERATING STATION l' t

PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 '

PLATTEVILLE, COLORADO 80651 ,

RE? ORT NO. 50-267/75/8

' Final IDENTIFICATION OF , l OCCURRENCEt l Adequate fire stops in the vertical cableways between floors in the reactor i

. building, in the horizontal cable trays and conduits from the auxiliary l electrical equipment room in the vertical cable ducts above the standby ,

generator rooms were not installed, per drawings issued and per FSAR, Appendix C.3-1.

. CONDITIONS.PRI'OR TO OCCURRENCE: Steady State Power Routine Shutdown la' Hot Shutdown Routine Load Change ,l Cold Shutdown Other (specify)

Refueling Shutdown X Routine Startup .

The major plant parameters at the time of the event were as follows:

l Power Rtr. 16.47 MWth Elect. O MNe {

Secondary Coolant Pressure 1216 psig I Temperature 306 'F Flow 1.209 x 106 f/hr. -

5 Primary Coolant Pressure 411 psig Temperature 270 *F Core Inlet 350 *F Core Outlet

.31 x los Flow' f/hr.

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o o Pcg2 2 DESCRIPTION OF .

OCCURRENCE:

Inspection revealed that adequate fire stops in'the vertical cableways between floors in the reactor building, in the horizontal cable trays, and conduits from the auxiliary electrical equipment room and in the l vertical cable ducts above the standby generator rooms were not installed i per drawings issued. ,

APPARENT CAUSE OF OCCURRENCE: Deaign Unusual Service Cond.

Including Environ.

Manufacture Component Failure

'X Installation /Const. Other (specify) ,

Operator Procedure ANALYSIS OF

• OCCURRENCE: .

Adequate fire stops should be installed to prevent 'the spread of fire and smoke and minimize the potential effects of such events to. safety.

CORRECTIVE ACTION:

General Atomic Work Authorization No. 92F1853 was issued to install fire stops as per details on drawings issued and installation has been inspected.

FAILURE DATA /SIMILAR REPORTED OCCURRENCES:

None PROGRAMMATIC IMPACT:

None CODE IMPACT:

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Submitted: -

, Reviewed m u ,/ 7-//-7/

V H.W.Hillfard Technical Services Supervisor ames H. Reader #*

Site Engineer Fort St. Vrain Nuclear Fort'St. Vrain Nuclear _

Generating Station Gen ating Station

,... Approved: q/ ._ <. -...o.'

frederic E. Swart Superintendent Nuclear Production 1 Public Service Company '

of Colorado '

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